<!--
 * @Author: xiuquanxu
 * @Company: kaochong
 * @Date: 2020-12-16 14:07:19
 * @LastEditors: xiuquanxu
 * @LastEditTime: 2020-12-16 14:14:49
-->
<html>
    <meta charset="utf-8"/>
    <style>
        .transition {
            width: 100px;
            height: 100px;
            background-color: black;
            transition: height 3s ease 1.5s;
        }
        .transition:hover {
            width: 200px;
            height: 200px;
        }
    </style>
    <body>
        <div class="transition">
            
        </div>
    </body>
</html>